Dog Mat for Back Seat Extender We have found that many people will put blankets on their dog seat cover for back seat that are not the right size or are not comfortable or aesthetically pleasing. We have designed the washable dog bed for back seat extender to make the dog more comfortable in the back seat extender. waterproof and wear-resistant The cover of the large dog bed is made of waterproof and wear-resistant fabric. Fit most back seat The size of dog mat for back seat cover is 50.7*16.5*1.8in.The size of dog mat for car back seat extender is 50.7*24.6*1.8in.The size of dog mat for truck back seat extender is 55.9*30.3*1.8in. Soft and comfortable The dog mat is used with the dog bed to make the dog more comfortable during the ride. Note The large dog bed is compressed packaging, after decompression will be a little flat at first, the dog mat will gradually become fluffy within 24 hours after opening the package.